STTB 2,5 - Double-level spring-cage terminal block

3031270

Double-level spring-cage terminal block, nom. voltage: 500 V, nominal current: 22 A, connection method: Spring-cage connection, Rated cross section: 2.5 mm2, cross section: 0.08 mm2 - 4 mm2, mounting type: NS 35/7,5, NS 35/15, color: gray

Product type Multi-level terminal block
Product family ST
Area of application Railway industry
Machine building
Plant engineering
Process industry
Number of connections 4
Number of rows 2
Potentials 2
Insulation characteristics
Overvoltage category III
Degree of pollution 3

Rated surge voltage 6 kV
Maximum power dissipation for nominal condition 0.77 W

Number of connections per level 2
Nominal cross section 2.5 mm²
Stripping length 8 mm ... 10 mm
Internal cylindrical gage A3
Connection in acc. with standard IEC 60947-7-1
Conductor cross section rigid 0.08 mm² ... 4 mm²
Cross section AWG 28 ... 12 (converted acc. to IEC)
Conductor cross section flexible 0.08 mm² ... 2.5 mm²
Conductor cross section, flexible [AWG] 28 ... 14 (converted acc. to IEC)
Conductor cross-section flexible (ferrule without plastic sleeve) 0.14 mm² ... 2.5 mm²
Flexible conductor cross section (ferrule with plastic sleeve) 0.14 mm² ... 2.5 mm²
2 conductors with the same cross section, flexible, with TWIN ferrule with plastic sleeve 0.5 mm²
Nominal current 22 A
Maximum load current 26 A (with 4 mm² conductor cross section)
Nominal voltage 500 V
Nominal cross section 2.5 mm²

Rated data (ATEX/IECEx)
Identification  II 2 GD  Ex eb IIC Gb
Operating temperature range -60 °C ... 110 °C
Ex-certified accessories 3030459 D-STTB 2,5
3030747 ATP-STTB 4
1204517 SZF 1-0,6X3,5
3022276 CLIPFIX 35-5
3022218 CLIPFIX 35
List of bridges Plug-in bridge / FBS 2-5 / 3030161
Plug-in bridge / FBS 3-5 / 3030174
Plug-in bridge / FBS 4-5 / 3030187
Plug-in bridge / FBS 5-5 / 3030190
Plug-in bridge / FBS 10-5 / 3030213
Plug-in bridge / FBS 20-5 / 3030226
Bridge data 17 A / 2.5 mm²
Ex temperature increase 40 K (21.9 A / 2.5 mm²)
Rated voltage 440 V
for bridging with bridge 440 V
- At bridging between non-adjacent terminal blocks 352 V
- At bridging between non-adjacent terminal blocks via PE terminal block 352 V
- At cut-to-length bridging with cover 220 V
- At cut-to-length bridging with partition plate 220 V
Rated insulation voltage 400 V
output (Permanent)
Ex level General
Rated current 19.5 A
Maximum load current 23.5 A
Ex connection data General
Nominal cross section 2.5 mm²
Rated cross section AWG 14
Connection capacity rigid 0.08 mm² ... 4 mm²
Connection capacity AWG 28 ... 12
Connection capacity flexible 0.08 mm² ... 2.5 mm²
Connection capacity AWG 28 ... 14
output (Permanent)
Ex level Level 1
Contact resistance 1.04 mΩ
output (Permanent)
Ex level Level 2
Contact resistance 0.83 mΩ

Width 5.2 mm
End cover width 2.2 mm
Height 67.5 mm
Depth on NS 35/7,5 47.5 mm
Depth on NS 35/15 55 mm